Hi Wim,
Sorry haven't got back to you sooner, have been out of office where 3g network average.
Yeah I would remove. Also mod/lang and mod/pix shouldn't be sitting in that directory and would remove.
I think you should remove mod/dialogue to then re install. It's looks like has been extracted into mod/ directory as the backup files are for the dialkogue module, I think pix and lang folders are probably for the dialogue module too.
Maybe try downloading then extracting on you desk top change name from dialogue-whatevergitcommitno to dialogue then re zip upload and extract on the hosted service.
Regards,
Troy